What is the primary function of the transverse tubules?
A. They attach muscle fibers to skeletal elements to exert force.
B. They conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils.
C. They act as a channel for Ca2+ ions during excitation-contraction coupling.
D. They attach troponin to tropomyosin.
E. They form cross-bridges between actin and myosin during muscle contraction.
Answer: B
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